/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs.protocol.datatransfer.sasl;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.UnsupportedCallbackException;
import java.io.IOException;
import java.util.List;

/** For handling customized {@link Callback}. */
public interface CustomizedCallbackHandler {
  class DefaultHandler implements CustomizedCallbackHandler{
    @Override
    public void handleCallback(List<Callback> callbacks, String username, char[] password)
        throws UnsupportedCallbackException {
      if (!callbacks.isEmpty()) {
        throw new UnsupportedCallbackException(callbacks.get(0));
      }
    }
  }

  void handleCallback(List<Callback> callbacks, String name, char[] password)
      throws UnsupportedCallbackException, IOException;
}
